Definition of electron shell Electron shell
We found 3 definitions of electron shell from 3 different sources.
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What does electron shell mean?
WordNet
Noun |
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| electron shell - a grouping of electrons surrounding the nucleus of an atom; "the chemical properties of an atom are determined by the outermost electron shell" |
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Wiktionary 
Wikipedia 
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An electron shell is the outside part of an atom around the atomic nucleus. It is a group of atomic orbitals with the same value of the principal quantum number "n".
Electron shells have one or more electron subshells, or sublevels. These sublevels have two or more orbitals with the same angular momentum quantum number "l". Electron shells make up the electron configuration of an atom. The number of electrons that can reside in a shell is equal to formula_1.
The name for electron shells comes from the Bohr model, in which groups of electrons were believed to go around the nucleus at certain distances, so that their orbits formed "shells".
Valence shell.
The valence shell is the outermost shell of an atom in its uncombined state, which contains the electrons most likely to account for the nature of any reactions involving the atom and of the bonding interactions it has with other atoms. Care must be taken to note that the outermost shell of an ion is not commonly termed valence shell. Electrons in the valence shell are referred to as valence electrons.
In a noble gas, an atom tends to have 8 electrons in its outer shell (except helium, which is only able to fill its shell with 2 electrons). This serves as the model for the octet rule which is mostly applicable to main group elements of the second and third periods. In terms of atomic orbitals, the electrons in the valence shell are distributed 2 in the single "s" orbital and 2 each in the three "p" orbitals.
For coordination c
